$A$ man whose father was colour blind marries a woman who had a colour blind mother and normal father. What percentage of male children of this couple will be colour blind (in $\%$)?

Haemophilia is an example of:

If a father is colorblind and the mother's father is colorblind,what is the probability of colorblindness in their offspring?

Which type of abnormality is seen in the given pedigree chart?

Mention any two autosomal genetic disorders with their symptoms.

Autosomal dominant disorder $- P$
Autosomal recessive disorder $- Q$
$X$-linked recessive disorder $- R$
$I -$ Haemophilia,$II -$ Sickle cell anaemia,$III -$ Phenylketonuria,
$IV -$ Thalassaemia,$V -$ Colour blindness,$VI -$ Myotonic dystrophy
Select the correct option for $P, Q$ and $R$.
$\quad\quad P \quad\quad Q \quad\quad R$